1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72833e836ad7e56b5f6b96f6e5a73ed95c7b2f249db81dfc41b746229f6dd7fe. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7c5f8c74-d784-44e1-8adb-baaa9b4461c8.json and https://artists.proofprofile.net/proofs/artist/7c5f8c74-d784-44e1-8adb-baaa9b4461c8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9c86b38089d04e7125c95312312edd11425945753538d3059798bbd0be4086. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa319c53909abf60b11b42b525fec110a486952957468d8348947cdd4ab4b78e6. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93931c64e2cc111397d478dc7959473ff9696a9fd680ff343faccf6ecf65c6a7. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfc1f0ad7c9a8521a2539bc1fca8a8e5d775c4a878e1c9966dc3bffb8d62302. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x118b17ce910fec0357f4203a4f0f20c4d440e1b226726c9499d412c333bdfede. Chain 2 (Bitcoin): anchored in block 957751 (2026-07-12T20:41:42Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd588a7ec41e1e099e3caa51a445f62c688e002801a3ea4c3eb4aa85c73f483. Chain 2 (Bitcoin): anchored in block 958341 (2026-07-17T01:08:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39cdbc085856890cff3960ef4aeed14364e5759b4539233c8ad75b735b133fef. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefece27a8e05642579e6b0f5173ca0367c3ab01c0f2afa4ac5cb74058965d50e. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02d745f406157b239ad30616eb43107bece33f25ba95fb453a634d8431e45819. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab389a8a0d3625fb4384c94f5311d2bea2d12a8f85fb4a6c3ac3183705a298a. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32fd2782b36f6f46e81bcdf1034ecd8f6bb360c81361f9b519769adff9ca5df1. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d8bb59b1771c63dca16edc0aad8324183b239c98f5dc25ec9a8ee45e0908e6. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94db3627000f378f400545f3fc4da015a950f5fe2820ab6c13e7f4d28c8cd90. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTCZ0966887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce459e27e3ad206d73a0823d9e5ae429d6fcf24475cf01719b943e011a1912e. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCABF1202980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa6546dca3f3530be57218e326ee2cb3461023a47f76b01b8e02bb02327fd35. Chain 2 (Bitcoin): anchored in block 957763 (2026-07-12T22:01:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCABF1202985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0b9577cac2f6723a9e1b267cab1ba1fd1feff8c618269fffc9bb036589f57c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCABF1202986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c6c35c817ae2ebd7483ee07b4a150a7f613346622c3270046dfb1c80ed56942. Chain 2 (Bitcoin): anchored in block 958143 (2026-07-15T10:15:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCABF1202987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb05b057290ea76dbc6364e152ef84147e2344e88976f6d33da6aa0184071a1. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3X51222311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe78de88d97357351eeb1eea89dac7fc67f0d992208b2d027aa0bf7e7428f9e7. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3X51222306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6507857dea80ac21b3756119f79a4b784d4bd3487faac561f7e7efd123cd7b14. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3X51222308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99358f96ab82700b087c945b7aa84317c69a2502a3c5a33b4f81286045bb5dca. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3X51222309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e7a02f8a4def0f214eece00b747b922f877cd8113db210f49c4f5f1751f01e. Chain 2 (Bitcoin): anchored in block 958495 (2026-07-18T04:39:02Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US3X51222310.